MEPS Testing Simulator
MEPS (Minimum Energy Performance Standards) is the GEMS determination heat pump water heaters sold in Australia must meet, tested under AS/NZS 5125.1 Appendix H. This tool simulates that test end to end.
Press play and watch a heat pump water heater run the whole sequence: system heat-up, the maximum draw-off that sets V50, re-heat, and the 24-hour tapping cycle. Change the tank volume, control-sensor position, shipped dead band, ambient condition and declared load size, and see how each one changes the result.
For more on what Appendix H requires, read our guide: Understanding AS/NZS 5125.1 Appendix H MEPS testing →
What this is
Every number comes from EnergyAE's own Python implementation of the Appendix H sequence, not an accredited test result, and the set point is solved to the 60 ± 1°C set water temperature H.3.4 requires rather than taken from the product's declared default. Appendix H was published 22 May 2026 and no laboratory data yet exists to validate it against. The GEMS Table 15 load-size cap comes from an exposure draft, not yet a made instrument.